GENERAL46205

• Permit No: M1980244
• IBM Index Class Name: General Documents
• Doc Date: 6/1/1994
• Doc Name: RESPONSE TO ITEM 17 OF THE PN M-80-244 AMENDMENT 6 STIPULATIONS
• From: GOLDER ASSOCIATES INC
• To: DMG
• Media Type: D
• Archive: No

• •- -1111111111111111111
Golder Auoelafes Inc. 999
200 Union Boulevard. Suite 500 ~ ~ _ V^ ^V~~ptr
Lakewood. CO USA 80228 ~ L'~ aa~~_ .ii S
Telephone [phone] •rV~~~.,1e•S~LLf`n
Fax [phone]
4F~:EfVED
May 31, 1994 Our Ref.: 943-2720.010
JUN 1 1994
Mr. Berhan Keffelew
Division of Minerals and Geology i°''"''^ ~~ ••'~ne,zls e Gec(ogy
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
RE: RESPONSE TO ITEM 17 OF THE PERMIT NO. M-80.244,
AMENDMENT NO. 6 STIPULATIONS
Dear Mr. Keffelew:
Mr. John Hardaway, Manager of Environment Affairs for the Pikes Peak Mining Company
(PPMC), has asked Golder Associates Inc. (Golder) to prepare a response to Item 17 of the
Permit No. M-80-244, Amendment No. 6 Stipulations. Specifically in response to your
concerns of the Carlton mill tailings.
Stipulation
The operator will provide the results of the long-term metals leaching and acid generation
tests before any of the material from the additional test area is loaded on the leach pad or
placed in the waste rock storage area. The Carlton tailings must be tested for cyanide,
metals leaching and acid generation prior to material disturbance. A report delineating test
results will be submitted to the O,QSce within ten working days of receipt ojthe results by the
operator. If the O,~ce determines that the generation and release of acid and/or metals has
the potential to violate applicable water quality standards for surface water or jeopardize the
existing or potential future uses of groundwater, the operator will propose to the O,/fice
measures that will protect the receiving waters from non-compliant releases. Such proposal
will be in the form of a permit modification and will be submitted to the Ojftce within 30
days of notification.
Golder presented results of laboratory testing performed on the Carlton mill tailings in the
Report on Tailings Relocation Plan Cresson Project presented as Appendix 5 of Volume 4
of the Amendment No. 6 Permit Application (Application). The following text presents a
summary of that discussion,
2.3.2 Geotechnical Characteristics
Previous investigations Golder (1993), Dames & Moore (1986), Woodward-Clyde (1990),
and Woodward-Clyde (1981)) were used to access the geotechnical chazacteristics of the
existing Carlton tails.
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